One of the strongest pieces of evidence against any denialist construction comes not from NASA's archives or from the sensors of modern orbiting probes, but from the fog of the Cold War and from the fiercest, most formidable and most competitive rival of the United States: the Soviet Union. One of the most naive and recurrent arguments of conspiracy theorists claims that traveling to the Moon was scientifically, technologically and biologically impossible because of the lethal radiation belts of Van Allen, the extreme temperature swings and the deadly hostility of the vacuum of space. And yet, on the other side of the Iron Curtain, thousands of Soviet engineers, physicists, chemists, astronomers and mathematicians were working feverishly and spending billions of rubles precisely to reach the very same goal. The Russians knew perfectly well that the undertaking was scientifically and ballisticallyThe colossal N1 launch vehicle, the Soviet answer to the American Saturn V. Photo courtesy of Roscosmos. feasible, for the simple, irrefutable reason that they had carried out the same astrodynamic calculations and the same environmental measurements as the Americans, reaching the very same practical conclusions: the Moon was within reach, accessible, reachable, and they were secretly and frantically eager to go there and conquer it! The physics of the universe, after all, does not answer to any political ideology. To understand how much the scientific leaders in Moscow believed in the feasibility of human lunar flight, you only need to look at the massive and top-secret N1-L3 program. While NASA was forging the Saturn V, the Soviet design bureau OKB-1 was assembling the N1, a colossal rocket standing over 100 meters tall and powered by an impressive battery of 30 engines at its base. Just like their colleagues across the ocean, the Russians had designed an orbital command module (the LOK) and a lunar lander (the LK) specifically intended to land a single cosmonaut (the legendary Alexei Leonov was the main candidate) on the surface of our satellite. As tangible, rock-solid proof of this titanic effort, the Soviet LK lunar landers did not remain mere sketches on paper, but were actually built, secretly tested without a crew in Earth orbit and, after the painful cancellation of the program, jealously preserved. Today, anyone who still doubts the reality of the Space Race can go and see up close the intricate plumbing, landing legs and thrusters of these magnificent machines, on public display at world-famous institutions such as the Moscow Aviation Institute (MAI), the RKK Energia company museum in Korolyov and, periodically, at various international science exhibitions in the West. The undeniable physical reality of these Soviet metal vehicles, designed to land on the same dust that would be walked by The Soviet LK Lunar Module. It could carry a single cosmonaut to the lunar surface. Photo courtesy of Roscosmos.NASA's astronauts, proves beyond appeal that the Moon landing was an absolutely real engineering goal, contested down to the last bolt, not a theatrical script! If the Van Allen belts had really been a wall of deadly, impassable radiation, as today's conspiracy theorists without the most basic grounding in particle physics suppose, the military bureaucrats and the brains of the Kremlin would never have authorized an engineering investment of such magnitude to build physical hardware destined to incinerate its own crew before it had even left Earth orbit. On the contrary, the Soviets knew the translunar radiation environment inside out. They had carefully mapped the Van Allen belts since the very first Sputnik satellites and the pioneering probes of the Luna program, measuring with Geiger instruments the density of protons and electrons trapped in Earth's magnetic field. Russian physicists knew, with the same mathematical certainty as NASA's engineers, that crossing those zones at very high speed, using the density of the spacecraft's aluminum shell and internal bulkheads as a shield, would mean a radiation dose of a few hundred millirads for the whole mission for the crew, a clinical dose comparable to a series of medical X-rays and utterly negligible as a threat to human survival. As practical, empirical proof of this, in September 1968 the Soviet Union launched the Zond 5 mission. On board this spacecraft, which raced through the Van Allen belts, flew around the Moon and returned safely, splashing down in the Indian Ocean, there were no lifeless electronic circuits, but a genuineThe first stage of the mammoth Soviet Moon rocket carried 30 NK-15 engines. Photo courtesy of Roscosmos. biological crew. On board were fruit flies, plants, seeds and, above all, two steppe tortoises. Those animals survived the cosmic bombardment and the dangers of interplanetary space perfectly, giving Moscow irrefutable clinical certification that the translunar corridor was navigable and biologically safe for living beings. Even the extreme hostility of the lunar surface, often described today by deniers as a sea of unstable dust or a thermal hell in which no machine could operate, had been scientifically studied, analyzed and conquered by Soviet probes well before Neil Armstrong climbed down the LM ladder. In February 1966, the Russian probe Luna 9 became the first human-made object to make a soft landing on the Moon and survive it. Its mechanical sensors and its sharp panoramic photographs confirmed beyond any shadow of doubt that the lunar regolith was a compact soil, porous, peculiar, but extremely solid, perfectly able to support the tonnage of a spacecraft without swallowing it, sweeping away the doomsday hypotheses about deadly alien "quicksand". The Russians empirically measured the albedo of the soil and the brutal surface temperature swings, amassing a treasure trove of thermodynamic data that matched to the millimeter the readings of NASA's Surveyor probes. The definitive argument, the one that conceptually shatters any Hollywood hoax theory, lies, however, in the fearless logic of agency and electronic espionage. In 1969, at the height of Cold War hysteria, the Soviet Union had a tracking and intelligence apparatus (SIGINT) of formidable power and global coverage. Moscow had deployed a whole fleet of disguised oceanographic ships across the oceans of the world, such as the mammoth "Kosmonavt Vladimir Komarov", bristling with huge radome-covered dish antennas strategically positioned to The Soviets certainly did try to fly to the Moon to beat the Americans in the space race. The N1 rocket on the launch pad at Baikonur. Photo courtesy of Roscosmos.intercept and analyze every single telemetry wave transmitted by the Apollo spacecraft. Soviet radars, moreover, physically tracked the mass of the Saturn V as it entered Earth orbit, translunar trajectory and lunar orbit, calculated the trajectories and, above all, their radio telescopes picked up and isolated the exact S-band signal of the Lunar Module "Eagle" as it descended through the vacuum toward the Sea of Tranquility. If NASA had tried to fake the mission by transmitting a pre-recorded radio signal from the Nevada desert or from a common spy satellite in low orbit, as conspiracy theorists often claim, Soviet technicians, by calculating the Doppler effect and triangulating the geometric origin of the radio wave, would have exposed the deception in a fraction of a second! Instead, faced with incontestable telemetry data whose physical source was unmistakably 384,000 km away on the surface of our satellite, the Soviet leadership took the defeat in silence. From the point of view of historical analysis, this official Soviet silence is the crowning, rock-solid proof of the authenticity of the Moon landings. If there had been even the tiniest anomaly in the data, or the slightest suspicion of a hoax, the gigantic Kremlin propaganda machine would have unleashed an unprecedented global scandal to humiliate the Western bloc, the degenerate capitalists and win the Space Race by default. Instead, they kept quiet. They kept quiet simply because the Soviet Academy of Sciences had independent technical means, direct and irrefutable, to certify the reality of the events! Besides the ocean fleet, the Soviets used the giant radio telescopes of the deep space communications center at Yevpatoria, in Crimea, to physically intercept and decode in real time the voice, television and direct telemetry frequencies transmitted by the entire Apollo Program. Soviet military ballistic computers , moreover, recorded and measured the perfect Doppler shift (the change in frequency of the electromagnetic wave) of the Apollo radio signals, which unequivocally showed the spacecraft physically accelerating toward the Moon and then decelerating for orbit insertion around it. Faced with this overwhelming mathematical, optical and electromagnetic evidence, gathered completely independently by its own military scientists, the Politburo had no choice but to accept total defeat in space. The Kremlin acknowledged the American success and the Russian cosmonauts sent their congratulations, fully aware that no film set could ever have fooled their radars, their telescopes in Crimea, their physicists and their engineers, who had for years been trying to master exactly the same treacherous rigors of space!